Silencer for internal-combustion engines



-B. CARLEN.

SILENCER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JUNE 21,1919.

Patented June 21, 1921.

UNITED STATES PATENT OFFICE.

IB-TABNE CARMEN, OF NORDSTRAND, NEAR OHRISTIANIA NORWAY.

SILENGER FOR INTERNAL-COMBUSTION ENGINES.

Application filed June 21,

- Engines; and I do hereby declare the following'to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it, appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Y The present invention relates to silencers for internal combustion engines of the type, in which the exhaust gases are conducted from the motor to the atmosphere through a number of narrow slotsserving to minimize the noise of the exhaust. According to the present invention the exhaust gases are conducted through a number of narrow slots arranged in a circular row and bein passed by the gases in the direction from t eir circumference toward the center so that the several branch currentsof the exhaust meet in the center of the slots.

Several embodiments of the invention are illustrated on the accompanying drawing.

Figure 1 is an axial section through one form ofthe invention and Fig. 2 is a section on the line 2-2 of Fig.1. Fig. 3 represents an axial section of another form of the invention and Fig. 4 is a section on the line 4-4 of Fig. 3. Fig. 5 is a section similar to Fig. 3, illustrating. a slight modification of I this form of the inventlon. Fig. 6 re resents another form of the invention and .ig. 7 is a section on the line 77 of Fig. 6; Fig. 8 is an axial section through a modified construction of the silencer illustrated on Fig. 6, and Fig. 9 is a section on the line 99 of Fig. 8. Fig. 10 is anaxial section through a modification of the silencer illustrated 'in Fi .e to 9. e

n all the embodiments of the invention illustrated the exhaust is introduced into the silencer througha channel 1 and let out Speeifieation of Letters Patent. Patented J He 21, 1921.

1919. Serial No. 305,834.

lar channel 3 with the central chamber 4 are formed between a number of wedge shaped radial vanes 5.

For convenience of construction the casing of the silencer may consist of two main parts 6 and 7 which are connected by means of flanges 8 and carry each one half of the radlal vanes 5 in such a manner that every second vane is cast integral with the member 7, while the other vanes are cast integral with the members 6.

The inlet tube 1 may be arranged axially w1th regard to the channel 3 as illustrated in F igs. 1 and 2 or tangentially as illustrated in Figs. 4 and 9.

For the purpose of-facilitating the milling vof the side faces of the vanes the adjacent surfaces of the vanes belonging to the same half of the silencer casing are made parallel z'. e. the adjacent surfaces of every second vane as seen in Figs. 2 and 4 are parallel.

The forms of the invention illustrated in Figs. 6 to 9 differ from the forms described above, only therein that annular disks 9 with wedge shaped cross-section are substi tuted for the radial vanes 5 in Figs. 1, 2 and 5. v

In Figs. 1-9 the vanes 5.are arranged in a circle eccentric tov the casin so that the chamber 3 is spiral in form. %he spaces between the vanes receive the gases at their narrow ends at the. outer periphery of the circle of'vanes and discharge the gases after vexpanding them, at the center of the circle The gases in Figs. 1,2,6 and? are L 9 the gases are admitted at the larger end of the chamber 3 tangentially to thevane sets.

In the modification illustrated in Fig. 10

the annular disks 9 are not wedge shaped but conical, the conicity of each disk being a little bigger than the conicity of the next one,

so that the slots formed between the disks has a wedge shaped cross-section.

. Claims: I

1. An exhaust silencer, comprising a casing, vanes arranged in a circle insaid casing and spaced from the sides of the casing to form a peripheral chamber, said vanes being straight and .flared from their inner ends 99 the r 9 1 9! 315 thereby forming straight tapered expansion passages from the periphery to the center of said series, an inlet for said chamber and an outlet at the center of said series of vanes.

2. An exhaust silencer, comprising a casing, vanes arranged in a circle and eccentrically in and spaced from the sides of said casing, said vanes being wider at their periphery than at the center and forming straight tapering expansion passages widening toward the center, an inlet on the casing to said chamber and an outlet on the casing at the center of the circle of vanes.

3. An exhaust silencer, comprising a circular two-part casing, a circular series of vanes on one casing part and a similar series on the other casing part, the vanes of one series alternating with the vanes on the other series to form expansion passages enlarging toward the center, the adjacent faces of two vanes of the same series being parallel plane surfaces, an inlet on one part of the casing and an outlet on the other part at the center of said vanes.

4. An exhaust silencer comprising two diskshaped members adapted to form one hollow diskshaped body, a circular row of radial vanes inside said hollow body, said radial vanes being alternately cast integral with one and the other, of said diskshaped members, and dividing the interior of said hollow body in an exterior annular channel, a central chamber and a number of radial slots leading from said annular channel to said central chamber.

1 5. An exhaust silencer comprising two diskshaped members adapted to form one hollow diskshaped body, a circular row of radial vanes inside said hollow body, said radial vanes being alternately cast integral with one and the other of said disk-shaped members, the adjacent side faces of the vanes belonging to one disk member being parallel said row of vanes dividing the interior of said hollow body in an exterior annular channel, a central chamber and a number of radial slots leading from said annular channel to said central chamber.

6. In a mufiler, a casing, a series of straight tapered vanes therein spaced from the peripheral Walls of said casing to form a gas chamber, said vanes forming between them narrow nozzles at their outer ends that gradually enlarge toward the center, means to direct exhaust gases into said peripheral chamber, and a central discharge.

7. In a muffler, a casing having a chamber at its periphery, an inlet to said casing, a distributer to distribute gases around said chamber from said inlet, an annular series of straight tapered vanes forming narrow slot-like nozzles between their outer ends adjacent said chamber, said nozzles gradually enlarging to the narrow ends of said vanes, and a discharge at the center of said vanes. I

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

BJARNE CARLEN. Witnesses:

MOGENS Bmeon, ELISE POULSBON. 

